What was found
RIGHT HORIZONTAL STABILIZER LOWER SKIN IS CRACKED AT THE I/B SIDE OF RIB STA 129.50 APPROX 9 INCHES FWD OF REAR SPAR. GROUNDED - YES. REMOVED DAMAGE AND REPAIRED RH HORIZ STAB LOWER SKIN AT STA 129.5 AT LOCATIONS APPROX 9 INCHES AND 17 INCHES FWD OF REAR SPAR THIS IS A CAT B REPAIR WITH A REPEAT INSPECTION OF 9,000 FLIGHT CYCLES AND A THRESHOLD OF 56,000 FLIGHT CYCLES IAW B737-800 SRM 55-10-012-2R-11.